If you want to be absolutely sure there is no cross pollination with Lakota and your other squash varieties, you must bag the flowers and hand pollinate.
I've never done that because that is a lot of work!! What I do, is spread the varieties out over my property so hopefully the bees will...
Some varieties are so slimy! What's been your favorite tomato? I happen to place Black Brandywine above all else but perhaps you have a kind worthy of trying!
Fellow heirloom seed collector addict here! For tomatoes, I pick a perfectly ripe one. Slice it up and put the seeds on a paper towel. Label it and place it in a spot to dry. Et voila! Seeds ready for next Spring!